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Stock-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Millions | 12 Months Ended
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Nov. 30, 2017 USD ($) period plan $ / shares Executives shares | Nov. 30, 2016 USD ($) $ / shares Executives shares | Nov. 30, 2015 USD ($) $ / shares Executives shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shareholder approved stock plans | plan | 1 |  |
Number of plans for which shareholder approval not required | plan | 2 |  |
Closing stock price on November 30, 2016 (in dollars per share) | $ / shares | $ 41.34 |  |
Unrecognized stock-based compensation expense, net of expected forfeitures | $ | $ 24.5 |  |
Costs are expected to be recognized, weighted average period | 2 years 2 months 19 days |  |
Number of executives whose employment was terminated | Executives | 3 | 2 | 3
Additional stock-based compensation expenses related to separation and acceleration vesting | $ | $ 1.5 | $ 0.3 | $ 0.3
2008 Stock Option And Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares issuable under stock plans (in shares) | 54,510,000 |  |
Shares available for grant under stock plans (in shares) | 3,129,512 |  |
2002 Nonqualified Stock Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares issuable under stock plans (in shares) | 9,750,000 |  |
Shares available for grant under stock plans (in shares) | 906,293 |  |
2004 Inducement Stock Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares issuable under stock plans (in shares) | 1,500,000 |  |
Shares available for grant under stock plans (in shares) | 583,021 |  |
Employee Stock Purchase Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares issuable under stock plans (in shares) | 9,450,000 |  |
ESPP offering period | 27 months |  |
ESPP number of purchase periods | period | 9 |  |
ESPP purchase price (as a percent) | 85.00% |  |
Employee stock purchase plan, issued shares (in shares) | 220,000 | 266,000 | 226,000
Weighted average purchase price of shares (in dollars per share) | $ / shares | $ 22.27 | $ 20.01 | $ 19.58
Shares available and reserved for issuance (in shares) | 815,000 |  |
Weighted average estimated fair value of options granted, per share (in dollars per share) | $ / shares | $ 8.32 | $ 7.43 | $ 6.89
General and administrative [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Additional stock-based compensation expenses related to separation and acceleration vesting | $ |  |  | $ 0.2
Sales and marketing [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Additional stock-based compensation expenses related to separation and acceleration vesting | $ | $ 0.8 | $ 0.2 | $ 0.1
Product development [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Additional stock-based compensation expenses related to separation and acceleration vesting | $ | $ 0.7 | $ 0.1 |
Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 1 year |  |
Weighted average estimated fair value of options granted, per share (in dollars per share) | $ / shares | $ 5.95 | $ 0.00 | $ 6.79
Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Number of common stock shares each restricted stock unit represents (in shares) | 1 |  |
Stock-based compensation service period | 3 years | 3 years |

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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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